An Optical Study of the Growth and Oxidation of Nickel Hydroxide Films

Hopper, M. A.; Ord, J. L.

doi:10.1149/1.2403417

Cited by 81 publications

(71 citation statements)

References 6 publications

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“…The oxidation of Ni(I1) oxide to NiOOH takes place via H+ transport through the oxide film [12]. Since this film is a poor conductor, the oxidation Cc: Visscher, E. Barendrecht / Anodic oxrde films of nickel Table 4 Refractive index (n -i k) for divalent nickel oxide and hydroxide species Species Medium Wavelength n This process is characterized by a current peak in the voltammogram.…”

Section: Oxidation Of Precycled Nickelmentioning

confidence: 99%

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Anodic oxide films of nickel in alkaline electrolyte

Visscher¹,

Barendrecht²

1983

Surface Science Letters

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Cyclic voltammetryand ellipsometry were applied to investigate the growth and nature of the anodic oxide film on nickel in O.lM KOH. At prereduced nickel a poorly conducting oxide IS formed which grows with constant refractive index in the potential range up to about 1 V. At higher potentials the changes in the ellipsometric parameters $ and A indicate a conversion into a good conducting oxide. By repeated oxidation and reduction a thicker oxide film is grown at the surface, this oxide is not identical with the anodically grown films as is shown by its different refractive index. From comparison with data for (Y-and /3-Ni(OH), it is concluded that the film formed at anodic potentials up to about 1 V must be considered to be NiO.xH,O.

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Section: Oxidation Of Precycled Nickelmentioning

confidence: 99%

“…On the basis of the refractive indices of film Ni(OH), electrodes, Hopper and Ord [12] assume that the reduced form of oxidized nickel is P-Ni(OH),.…”

Section: Introductionmentioning

confidence: 99%

Anodic oxide films of nickel in alkaline electrolyte

Visscher¹,

Barendrecht²

1983

Surface Science Letters

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“…For a-Ni(OH)2 a value of 1.52 -0 i (X 632.8 nm) has been reported [3]. Density values of 3 Ni(OH)2.2 H20 (= a-Ni(OH)2) and~-Ni(OH)2 differ considerably: 2.6-2.8 g.cm-3 for a-Ni(OH)2; 3.9 g.cm-3 for~-Ni(OH)2 [I]; so it is concluded that the thin~-films as deposited here.…”

Section: Introductionmentioning

confidence: 95%

Ellipsometry of Nickel-Oxides and -Hydroxides in Alkaline Electrolyte

Visscher

1983

J. Phys. Colloques

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Citation for published version (APA): Visscher, W. (1983). Ellipsometry of nickel-oxides and -hydroxides in alkaline electrolyte. Journal de Physique. Colloque, 44(C10), 213-216. DOI: 10.1051/jphyscol:19831044, 10 Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nl providing details and we will investigate your claim. AbstractThe growth and oxidation of thin Ni(OH)2 films deposited on Ni were investigated by ellipsometry. The refractive indices of a-Ni(OH)2.~-Ni(OH)2 and YZ-NiOOH were obtained at the wavelength 546.1 nm. Furthermore. the anodic oxidation of Ni in 0.1 M KOH was studied. The passive oxide layer is initially Nio.x HZO. Repeated anodic and cathodic potential cycling change the optical properties of this layer and leads to the growth of a low density oxide layer.

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“…Recently, Abd El Aal [8,9] confirmed that the film formed in the passive region is composed of NiO (inner) and b-Ni(OH) 2 (outer) in borate solutions; NiO being the passivating species. At potentials above a critical value, the b-Ni(OH) 2 film is converted to an Ni(III) oxide phase, identified by ellipsometry as b-NiOOH [10]. The conversion of b-Ni(OH) 2 to b-NiOOH is a complex process [10,11].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Halide Anions on the Anodic Behavior of Nickel in Borate Solutions

Aal

Haleem

2005

Chem. Eng. Technol.

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The anodic behavior of nickel in Na 2 B 4 O 7 solutions containing various concentrations of NaCl, NaBr, or NaI as pitting corrosion agents was studied using the potentiodynamic technique. In absence of the halide anions, the E/i curves exhibit active and passive regions prior to oxygen evolution. The passivity is due to the formation of nickel oxides on the electrode surface. The presence of low concentrations of the halide anions has no effect on the mechanism of nickel passivity. High aggressive anion concentrations stimulate the active region and tend to break down the passive film, leading to pitting corrosion. The susceptibility of the nickel anode to pitting corrosion is enhanced with increasing halide anion concentration and is decreased with increasing pH of solution. The aggressiveness of the halide anions towards the stability of the passive film decreases in the order: Cl ± > Br ± > I ± . .

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An Optical Study of the Growth and Oxidation of Nickel Hydroxide Films

Cited by 81 publications

References 6 publications

Anodic oxide films of nickel in alkaline electrolyte

Anodic oxide films of nickel in alkaline electrolyte

Ellipsometry of Nickel-Oxides and -Hydroxides in Alkaline Electrolyte

The Influence of Halide Anions on the Anodic Behavior of Nickel in Borate Solutions

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